From f930e707e8023bdfca492b7812056f7c36b400b6 Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Tue, 19 Aug 2008 17:41:55 +0000
Subject: [PATCH] Added checked against an empty _kdNodes list before
 commensing with intersection

---
 src/osg/KdTree.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/osg/KdTree.cpp b/src/osg/KdTree.cpp
index 7628415d3..7d9cfb0fd 100644
--- a/src/osg/KdTree.cpp
+++ b/src/osg/KdTree.cpp
@@ -755,6 +755,8 @@ bool KdTree::build(BuildOptions& options, osg::Geometry* geometry)
 
 bool KdTree::intersect(const osg::Vec3& start, const osg::Vec3& end, LineSegmentIntersections& intersections) const
 {
+    if (_kdNodes.empty()) return false;
+
     int numIntersectionsBefore = intersections.size();
 
     IntersectKdTree intersector(*_vertices,